BC valves are made from premium stainless steel, fully machined and swirl polished for ultimate air flow. Dished head for added weight savings and increased valve control at high rpm. Standard and oversize head. To ensure you get the correct length valves you must measure your stock valves as Brain Crower valves are available in 104.78mm and 106.12mm over all length. Notes: Sold in sets of 8. Oversized valves required headwork to be compatible. Must specify short (104.78mm OAL) or long (106.12mm OAL) tip valves when ordering!